If it's numerous pictures (have to already be in gif format), there's always unfreez. It's a freeware animated gif creator. Really simple, just drag and drop the gif files for use into the program and press a button.

If you need help getting decent quality gif files, I suggest using Ifranview which is also freeware.

If it's in video format, then many things should be able to help. Look around for stuff like Total Video Converter. It's not freeware though...